Magneto ignition apparatus



Oct. 25, 1932. F. ALLENDORFF MAGNETO remnou APPARATUS Filed Feb. 12, 1932 2 Sheets-Sheet l Oct. 25, 1932. F. ALLENDORFF MAGNETO IGNITION APPARATUS Filed Feb. 12, 1932 2 Sheets-Sheet 2 Patented Oct. 25, 1932 UNITED STATES FRITZ ALLENDORFF,

PATENT OFFICE GESELLSGHAFT, F STUTTGABT, GERMANY MAGNETO IGNITION APPARATUS Application filed February 12, 1932, Serial No. 592,645, and in Germany February 23, 1931.

The present invention relates to a magneto ignition apparatus in which the interrupter with the rotary magnet and the stationary armature are arranged combined in a closed chamber. The distributor and the distributor gearing are usually placed in a second closed chamber.

In order to obtain, for such magnetos, a suitable ventilation of the interrupter and of the distributor even in dusty situations, both chambers according to the invention, are provided with ventilation openings which are protected by known means against the penetration of dust and water.

An example of construction of the invention is shown in the accompanying drawings, in which Figure 1 shows a magneto ignition apparatus, partly in section.

Figure 2 a View of thebottom of the casing, AFi/ggure 3 a section of Figure 1, on the line Figure 4 an elevation of a protective cap.

In Figure 1 the front wall of the magneto 25 casing a together with the bearing cover I) and the cover 0 of the magneto encloses a chamber in which are arranged the rotary magnet d, the armature body e with the coil 7 and the interrupter 9. On the other side of the wall a is located the rotary distributor piece it with the distributor gearing A closed chamber is here formed also by the front wall a of the casing, a part on of the bottom of the casing, a metal cover it and the distributor disc 0. In each of the longitudinal walls 20 (Figure 3) of the magneto casing is an opening g, which is closed by a piece of felt s laid between two perforated plates 7. These openings are covered by caps t, the edge u (Figure 4) of which has a cut away part 21 only on the lower side, so that water running on to the magneto or sprayed against it cannot penetrate into the opening 9 in the casing. Inthe bottom of the casing a is an opening w. The path of the air which, when the magneto is erected, can generally enter only from the side, is so formed by means of ribs :1: in the bottom of the casing and openings y in the ribs, that the air must change direction several times during its course. The path of the air is indicated by the arrows in Figure 2. A passage 2 leads from the opening w to the chamber in which the distributor is located.

By the ventilation arrangement described, oil vapours arising in the chamber of the magneto and the gases formed by the sparking of the interrupter are removed and replaced by fresh air, without dust or water being able to penetrate into the interior of the magneto;

I declare that what I claim is:

1. A magneto ignition apparatus comprismg an armature, a magnet rotatable. relatively to said armature, an interrupter, a chamber having ventilating openings therein enclosing said armature, magnet and interrupter, a distributor, a chamber enclosing said distributor and means to protect said ventilating openings.

2. A magneto ignition apparatus comprising an armature, a magnet rotatable relatively to said armature, an interrupter, a

chamber having ventilating openings there- 1 in enclosing said armature, magnet and interrupter, a distributor, a chamber having ventilating openings enclosing said distributor, and means to protect said Ventilating openings from the penetration of dust and water. J

3. A magneto ignition apparatus comprising an armature, a magnet rotatable relatively to said armature, an interrupter, a chamber having two axially parallel walls provided with ventilating openings enclosing said armature, magnet and interrupter, a distributor, a chamber enclosing said distributor, covers permeable to air but impermeable 'to dust in said ventilating openings and caps cut away at the bottom shie ding said covers.

4. A magneto ignition apparatus comprising an armature, a magnet rotatable relatively to said armature, an interrupter, a chamber having ventilating openings enclosing said armature, magnet and interrupter, a. distributor, a chamber enclosing said distributor, a rib on the base of said first mentioned chamber having openings therein to form a labyrinth path and an opening between said ribs communicating with said chamber enclosing the distributor. A

In testimony whereof I have hereunto aflixed my signature.

FRITZ ALLENDORFF. 

